Grouping and summaries of items in SfDataGrid are manipulated based on a group key. When you drag and drop an item from one group to another group, the group key of the dragged item will differ from the group key of the items in the dropped group. Hence by default the summaries will not be updated. This is the actual behavior of SfDataGrid.
Hence, in order to update the summaries when a row is dragged and dropped between groups you need to call the UpdateCaptionSummaries and Refresh methods in the QueryRowDragging event.
This page will automatically be redirected to the sign-in page in 10 seconds.